# SDR DALA2020121704140

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 16, 2020
- Submitted: December 17, 2020
- Operation: Air carrier
- Aircraft: [N854NW](https://openairdocs.org/aircraft/N854NW), registered now
- Make and model: Airbus A330-223
- Registry model: [Airbus A330-223](https://openairdocs.org/model/airbus-a330-223) (OpenAirDocs)
- Aircraft serial: 0620
- Aircraft time: 67,784 hours, 8,588 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Condition: No Test
- Location: Emergency Lights
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2020121704140

## Discrepancy

EPSU 19WL LOCATED IN RT CEILING BETWEEN FR 59-FR 60 FAILS BITE CHECK.  CORRECTIVE ACTION: REMOVED AND REPLACED EPSU 19WL, PER A330 AMM 33-51.

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